UFO truth seekers celebrated an historic milestone last month after it emerged the Department of Defense had run a top secret unit investigating the threat posed by UFOs until 2012.

Footage filmed by a US Navy pilot of an apparent UFO said to "defy the laws of physics", which was investigated by the department, was also released, leading to claims from some that "we are not alone”.

The footage was from the "Nimitz UFO" incident off the coast of San Diego in November 2004, when a whole naval crew are said to have seen a series of bizarre white tic tac-shaped crafts.

However, some in the UFO community remain suspicious at the motives of the government behind the release of the information.

Alien truth have called for "disclosure" - the release of all alien and UFO-related files to be released.

And many saw last month's revelations as a stepping stone towards this.

Many believe that aliens, not only exist, but are secretly living in bases on earth and the US government covers it up in return for flying saucer technology.

However, some members of the Mutual UFO Network (MUFON) remain suspicious.

MUFON is the world's largest organisation dedicated to UFO research and holds a global database of UFO sightings reported to it.

A theory was raised at the latest meeting of the MUFON Washington branch on Saturday.

Ptleader.com reported: "Those who attended were far from feeling credulous or validated by the New York Times’ coverage, and instead expressed concerns that this seeming bombshell of disclosure might merely represent an even deeper conspiracy by the government.

"They freely exchanged theories about the possible nature of UFOs, as well as what might motivate the mainstream press and government to release such a story.

"A frequently voiced suspicion was that the government might be laying the groundwork to present extraterrestrials as the next threat to national security, requiring further increases in military spending and curtailments of civil liberties."